Products > Test Equipment
open source GPIB adapter
dazz1:
--- Quote from: tautech on April 11, 2024, 06:37:08 am ---Test is it ?
Unconnected NET pin 1 J3. :P
--- End quote ---
No not quite. The pcb is correct. That pin, and the one on the other header are "V" on the HP logic analyser 40 pin pseudo standard. "V" is not connected on my scope. So this connection would only be active if a HP LA was connected, and the other header was connected to something that needed "V". That is extremely unlikely but it didn't cost anything to add the track, and the other LA signals not used by the scope. So all good.
Also pin 5 is NC on the HP standard.
Edit: On closer inspection, the line indicates the "J3" label is linked to the connector, because I had selected the J3 label. So no problem but well spotted.
tautech:
--- Quote from: dazz1 on April 11, 2024, 08:44:33 am ---
--- Quote from: tautech on April 11, 2024, 06:37:08 am ---Test is it ?
Unconnected NET pin 1 J3. :P
--- End quote ---
No not quite. The pcb is correct. That pin, and the one on the other header are "V" on the HP logic analyser 40 pin pseudo standard. "V" is not connected on my scope. So this connection would only be active if a HP LA was connected, and the other header was connected to something that needed "V". That is extremely unlikely but it didn't cost anything to add the track, and the other LA signals not used by the scope. So all good.
Also pin 5 is NC on the HP standard.
Edit: On closer inspection, the line indicates the "J3" label is linked to the connector, because I had selected the J3 label. So no problem but well spotted.
--- End quote ---
Not what I spotted.....the little arrow on the Pin 1 trace that the ratsnest link connects to.
I believe with your editor this indicates a not fully terminated NET.
dazz1:
--- Quote from: tautech on April 11, 2024, 09:14:13 am ---
Not what I spotted.....the little arrow on the Pin 1 trace that the ratsnest link connects to.
I believe with your editor this indicates a not fully terminated NET.
--- End quote ---
It's a warning about pin 1 pad attributes not matching the symbol. Not an open net and not a problem.
dazz1:
Hi
I have shared my GPIB breakout board on PCBway here:
https://www.pcbway.com/project/shareproject/GPIB_Break_Out_Board_f7812b3e.html
I have order parts for 5x boards, because of MOQ's so I will have 4x for sale.
dazz1:
Hi
I have edited this post because I have made a new version 2.0 of the GPIB breakout board. I have scrapped the version 1.0 boards.
The version 2.0 has the termination network required by HP for digital inputs. The resistors and capacitors on each signal line are SMD fitted between the pins of the headers. These pins provide some physical protection for the components to stop them getting knocked off. The capacitor/resistor are stacked to keep the pcb design simple and neat. There are 3 smd components but it looks like only 2 in the photos.
This breakout board allows direct connection to an HP logic analyser, I don't have, or my HP54645D oscilloscope.
The other header provides direct connection to all of the raw GPIB signals. This allows for an adapter to be made for another instrument that is not an HP.
I have shared my version 2.0 GPIB breakout board on PCBway here:
https://www.pcbway.com/project/shareproject/GPIB_Break_Out_Board_f7812b3e.html
I have made the first two version2.0 GPIB breakout boards.
I only need one breakout board and I have a bag of parts I don't need. I could make up a kit set to sell if there is any interest.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version